Rubber composition, green tire tread, tire and preparation method

Abstract

According to the rubber composition, the green tire tread, the tire and the preparation method, long-chain alkoxy modified sulfydryl silane is adopted in the composition to replace a common silane coupling agent, the surface energy of precipitation-method white carbon black can be reduced, silicon hydroxyl on the surface of the white carbon black can be shielded, agglomeration of the precipitation-method white carbon black is further blocked, and the service life of the green tire tread is prolonged. The dispersity of the precipitation-method white carbon black is improved. During banburying, the long-chain alkoxy modified sulfydryl silane can react with vinyl in the diene rubber and the modified dicyclopentadiene resin to form certain chemical bonding rubber, so that the bonding strength of the rubber composition is improved. Meanwhile, by matching with optimization and adjustment of a vulcanization system and adopting an efficient series production process, the silanization reaction time can be shortened, and the high-performance green tread rubber can be obtained. Besides, zinc oxide, stearic acid and N-cyclohexyl-2-benzothiazole sulfenamide are adopted as vulcanization accelerators, so that the use of amine accelerators is greatly reduced, and the harm to a human body is reduced. The rubber mixing time and the silanization reaction temperature can be shortened by taking sulfur as a vulcanizing agent. The tensile strength, the elongation at break, the compression heat generation and the rebound resilience of the tread prepared by the invention are obviously improved, the dynamic performance is relatively good, the internal energy loss during deformation is relatively small, and the characterization rolling resistance performance is relatively good; the rolling resistance and the wetland performance of the prepared tire reach the European Union label A level.

Description

Technical Field

[0001] The invention belongs to the technical field of tires and relates to a rubber composition, a green tire tread, a tire and a preparation method. Background Art

[0002] With the continuous development of the tire industry, people's environmental awareness and safety awareness are increasing, and higher and clearer requirements are put forward for the energy saving, safety, durability and other performance of tires.

[0003] The rolling resistance of tires directly affects the driving economy, the anti-skid performance is related to the safety of people and property, and the wear resistance is not only related to driving costs, but also has great significance for reducing tire replacement and protecting the environment. Based on the above situation, low rolling resistance, high anti-skid and high wear resistance tires have become a research hotspot in recent years. At the same time, these three aspects of performance affect and restrict each other, which is known as the "devil's triangle" of tire performance.

[0004] The current mainstream tire manufacturing technology is to use solution-polymerized styrene-butadiene rubber as the main material in the tread formula, combined with a large amount of highly dispersed silica to break the traditional "devil's triangle". Silica is an inorganic non-metallic material that has poor compatibility with most petroleum-based materials in the tread formula. Therefore, how to improve the compatibility and bonding between silica and rubber is one of the key research focuses in the industry. In addition, the surface of silica is rich in hydroxyl groups, which is very easy to agglomerate, resulting in poor dispersion and poor process performance. Therefore, how to ensure the operability of the production process while improving tire performance is also a common problem in the industry. Summary of the invention

[0005] The purpose of the present invention is to provide a rubber composition, a green tire tread, a tire and a preparation method to solve the problem of poor dispersibility when white carbon black is used in the existing tire tread.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The present application provides a rubber composition, which comprises diene rubber, carbon black, precipitated silica, long-chain alkoxy-modified mercaptosilane, silica dispersant, modified dicyclopentadiene resin, microcrystalline wax, zinc oxide, stearic acid, and environmentally friendly aromatic oil, wherein the diene rubber comprises natural rubber and non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber.

[0007] Diene rubber has the characteristics of high strength, high wear resistance and aging resistance, and is an important raw material for manufacturing tires. The diene rubber used in this application includes natural rubber and non-oil-filled double-end modified solution-polymerized styrene-butadiene rubber. Among them, the natural rubber uses standard 20# natural rubber, whose ash content is less than 1.0%; chemical impurities are less than 0.16%; and volatile matter is less than 0.8%. Natural rubber has excellent elasticity, wear resistance, insulation and sound insulation effects, and can improve the wear resistance of the tread. In addition, standard 20# natural rubber is easy to combine with other materials and is easy to process.

[0008] Since the molecular chain ends of the non-oil-filled double-end modified solution-polymerized styrene-butadiene rubber are coupled by tin, the random thermal motion of the molecular chain ends can be reduced, thereby reducing the intramolecular friction loss and the hysteresis loss. When it is applied to the tire tread, it can have a lower rolling resistance, and the anti-skid performance does not change much, and it better balances the anti-skid performance, rolling resistance and wear resistance. In the non-oil-filled double-end modified solution-polymerized styrene-butadiene rubber in this application, the styrene content is 21wt%, the vinyl content is 55wt%, the glass transition temperature is -36°C, and the Mooney viscosity ML (1+4) 100°C is typically 70-80.

[0009] Long-chain alkoxy-modified mercaptosilane is prepared by modifying mercaptosilane with long-chain alkoxy groups, and is an existing commercially available product. The surface energy of precipitated silica can be reduced by modifying mercaptosilane with long-chain alkoxy groups, thereby preventing the agglomeration of precipitated silica, improving the dispersibility of precipitated silica, and improving the processing safety performance of the rubber compound. In addition, during banburying, the long-chain alkoxy-modified mercaptosilane can react with the vinyl in diene rubber and modified dicyclopentadiene resin to form a certain chemically bonded rubber, thereby improving the bonding strength of the rubber composition.

[0010] In the present application, long-chain alkoxy-modified mercaptosilane is used instead of ordinary silane coupling agent, the vulcanization system is optimized and adjusted, and an efficient series production process is adopted to shorten the silanization reaction time and obtain high-performance green tread rubber.

[0011] In the present application, the long-chain alkoxy-modified mercaptosilane has a heating loss of ≤3.5% at 100°C*2h, and a refractive index of 1.4500-1.4800.

[0012] Carbon black is mainly composed of carbon, in black granular or powder form, with good conductivity, adsorption capacity and diffusion. The iodine absorption value of carbon black is less than 125g / kg, and the DBP absorption value is less than 130*10-5m 3 / kg, heating loss at 125℃<2.0%, residue on 45 mesh sieve<1000mg / kg.

[0013] Precipitated white carbon black is mainly composed of silicon dioxide and has a large specific surface area of ​​about 165m2 / g, with good dispersibility and viscosity. The heating loss of precipitated silica at 105℃ is 4%-8%, the burning loss at 1000℃*2h is less than 7%, and the water-soluble matter is less than 2%.

[0014] The white carbon black dispersant has an adsorption and wetting effect, and can be adsorbed on the surface of the precipitated white carbon black particles, making them easy to wet, reducing the interaction force between the particles, and making the precipitated white carbon black particles easier to disperse. In addition, the white carbon black dispersant can also form an adsorption layer on the surface of the precipitated white carbon black particles, increase the charge on the surface of the particles, increase the reaction force between the particles, and prevent the particles from aggregating. The white carbon black dispersant used in this application is selected from Rheinland Aflux37 of the German Lanxess Group.

[0015] Modified dicyclopentadiene resin is a hydrogenated dicyclopentadiene resin, and its molecular chain before modification is chain-shaped or ring-shaped, and the steric hindrance is large. After hydrogenation modification, dicyclopentadiene resin has high light stability and adhesion, and can improve the grip of rubber. The modified dicyclopentadiene resin in this application adopts commercially available modified dicyclopentadiene resin, which has a softening point of 95-105°C, an acidity of ≤0.5mg in terms of KOH, an ash content of ≤0.1% at 550°C, a heating loss of ≤0.1% at 105°C*2h, and a flash point of >200°C.

[0016] Microcrystalline wax is a white amorphous non-crystalline solid wax, mainly composed of C31-70 branched saturated hydrocarbons, containing a small amount of cyclic and straight-chain hydrocarbons, and the ash content is below 0.05%. The addition of microcrystalline wax can form uniform crystallization points during the tread formation process, increase the strength and rigidity of the tire, and improve the mechanical properties of the tire. In addition, microcrystalline wax also has the effect of enhancing wear resistance and increasing the friction coefficient.

[0017] Zinc oxide can enhance the thermal conductivity, wear resistance and tensile strength of tires. It can also serve as a vulcanization accelerator to shorten the vulcanization time and improve the vulcanization efficiency.

[0018] Stearic acid is a white waxy transparent solid that can improve the plasticity and fluidity of the rubber, reduce the viscosity of the rubber, and facilitate processing. In addition, stearic acid can also be used as a vulcanization accelerator to react with zinc oxide to shorten the vulcanization time and improve the vulcanization efficiency.

[0019] Environmentally friendly aromatic oil is a viscous liquid with a density of 0.942g / cm 3 , flash point>220℃, aniline point 75℃<R2<90℃. Environmentally friendly aromatic oil does not contain polycyclic aromatic hydrocarbons and heavy metals. It is a non-toxic aromatic oil that complies with EU reach regulations. Environmentally friendly aromatic oil has good rubber compatibility, high temperature resistance, low volatility and other characteristics. It can significantly improve the processing performance of rubber and has a good effect on the grip and braking of tires.

[0020] In the present application, the rubber composition includes, by weight, 100 parts of diene rubber, 0-10 parts of carbon black, 60-70 parts of precipitated silica, 5-6 parts of long-chain alkoxy-modified mercaptosilane, 2-3 parts of silica dispersant, 5-8 parts of modified dicyclopentadiene resin, 1-2 parts of microcrystalline wax, 2-3 parts of zinc oxide, 2-3 parts of stearic acid, and 5-10 parts of environmentally friendly aromatic oil, wherein the diene rubber includes 20-30 parts of natural rubber and 70-80 parts of non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber.

[0021] In addition, the rubber composition provided in the present application also includes 2-3 parts of N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine (antioxidant 4020), 1-2 parts of N-cyclohexyl-2-benzothiazole sulfenamide and 2-2.5 parts of sulfur. Among them, N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine is an antioxidant, N-cyclohexyl-2-benzothiazole sulfenamide is an accelerator, and sulfur is a vulcanizing agent.

[0022] In the present application, zinc oxide, stearic acid and N-cyclohexyl-2-benzothiazole sulfenamide are used as vulcanization accelerators, which greatly reduces the use of amine accelerators and reduces harm to the human body. Using sulfur as a vulcanizing agent can shorten the rubber mixing time and the silanization reaction temperature.

[0023] The present application also provides a green tire tread, which is prepared from the rubber composition.

[0024] The present application also provides a method for preparing a green tire tread, the method comprising: S01: Add diene rubber, white carbon black dispersant, modified dicyclopentadiene resin, microcrystalline wax, zinc oxide and stearic acid into the upper internal mixer of the series internal mixer, mix at a high speed at 60 rpm, add carbon black and precipitated white carbon black and mix at a high speed to obtain a mixture a; wherein the diene rubber includes natural rubber and non-oil-extended double-end modified solution polymerized styrene-butadiene rubber.

[0025] Natural rubber, non-oil-extended double-end modified solution polymerized styrene-butadiene rubber, white carbon black dispersant, modified dicyclopentadiene resin, microcrystalline wax, zinc oxide and stearic acid were simultaneously added to the upper internal mixer of the series internal mixer, and mixed at a high speed of 60 rpm for 30 seconds. Then, carbon black and precipitated white carbon black were added and mixed at a high speed for 30 seconds to obtain a mixture a.

[0026] S02: Add environmentally friendly aromatic oil to the mixture a, reduce the speed to 45 rpm and continue mixing until the temperature reaches 125° C. to obtain a mixture b.

[0027] After high-speed mixing, environmentally friendly aromatic oil was added to mixture a, and the speed was reduced to 45 rpm to continue mixing, so as to avoid the problem of short mixing time due to excessively rapid temperature rise of rubber in the later stage by reducing the speed. When the temperature was raised to 125°C, mixture b was obtained.

[0028] S03: adding long-chain alkoxy-modified mercaptosilane to the mixture b, reducing the speed to 40 rpm and continuing to mix until the temperature reaches 135° C., to obtain a mixed product c.

[0029] S04: Add zinc oxide to the mixture c, reduce the speed to 35 rpm and continue mixing until the temperature reaches 145° C., and then discharge into the lower internal mixer.

[0030] S05: The lower internal mixer is mixed at a constant temperature of 140° C. for 2 minutes, and then discharged into an automatic open mixer, and the mixing is continued for 3.5 minutes, and then the sheet is cooled to obtain a masterbatch.

[0031] S06: the masterbatch which has been stored for 8 hours is mixed with N-cyclohexyl-2-benzothiazolesulfenamide and sulfur for 2.5 minutes and then discharged into an automatic mixing mill. After further mixing for 2 minutes, the masterbatch is cooled to obtain a final rubber mix.

[0032] S07: Extruding the final rubber mixture that has been stored for 8 hours into a tread to obtain a green tire tread.

[0033] The final rubber compound that has been parked for 8 hours is fed into a three-compound extruder and extruded into a tread according to standard size to obtain a green tire tread.

[0034] The present application also provides a tire, which includes the above-mentioned green tire tread.

[0035] The present invention has the following beneficial effects: (1) The use of long-chain alkoxy-modified mercaptosilane can reduce the surface energy of precipitated silica, thereby preventing the agglomeration of precipitated silica and improving the dispersibility of precipitated silica. In addition, during mixing, long-chain alkoxy-modified mercaptosilane can react with the vinyl in diene rubber and modified dicyclopentadiene resin to form a certain chemically bonded rubber, thereby improving the bonding strength of the rubber composition.

[0036] (2) In this application, long-chain alkoxy-modified mercaptosilane is used to replace ordinary silane coupling agents. The long-chain alkoxy-modified mercaptosilane has high activity and reacts violently when in-situ modifying white carbon black. The silanization reaction time should be reduced by 50%, shortening the rubber mixing time and silanization reaction temperature. At the same time, with the optimization and adjustment of the vulcanization system and the use of an efficient series production process, the silanization reaction time can be shortened to obtain high-performance green tread rubber.

[0037] (3) In this application, zinc oxide, stearic acid, and N-cyclohexyl-2-benzothiazole sulfenamide are used as vulcanization accelerators, which greatly reduces the use of amine accelerators and reduces harm to the human body. Using sulfur as a vulcanizing agent can shorten the rubber mixing time and silanization reaction temperature.

[0038] (4) The tensile strength, elongation at break, compression heat generation and rebound performance of the tread prepared in the present application are significantly improved, the dynamic performance is better, the internal energy loss during deformation is less, and the rolling resistance performance is better.

[0039] (5) The rolling resistance and wet performance of the tires prepared in this application both reach the EU label A level. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is the DMA (Dynamic mechanical analysis) temperature scan diagram of the tread rubber of the two test groups; the red line is the storage modulus, the green line is the test temperature, and the purple line is the loss factor; Figure 2 The graph is the storage modulus of the vulcanized rubber of the tread rubber of test groups 1-3; Figure 3 This is the vulcanized rubber loss factor Tanδ diagram of the tread rubber of test groups 1-3. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further explained and illustrated by means of specific embodiments below.

[0042] Example 1 An embodiment of the present application provides a rubber composition, which includes 25kg of natural rubber, 75kg of non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber, 8kg of carbon black, 65kg of precipitated silica, 5kg of long-chain alkoxy-modified mercaptosilane, 2kg of silica dispersant, 5kg of modified dicyclopentadiene resin, 1.5kg of microcrystalline wax, 2kg of zinc oxide, 2kg of stearic acid, 10kg of environmentally friendly aromatic oil, 2.2kg of N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine, 1.2kg of N-cyclohexyl-2-benzothiazolesulfonamide and 2.15kg of sulfur.

[0043] The present embodiment also uses the rubber composition to prepare a green tire tread, and the preparation method of the tread includes: S101: Natural rubber, non-oil-extended double-end modified solution polymerized styrene-butadiene rubber, white carbon black dispersant, modified dicyclopentadiene resin, microcrystalline wax, zinc oxide and stearic acid are simultaneously added into the upper internal mixer of the series internal mixer, and mixed at high speed at 60 rpm for 30 seconds. Carbon black and precipitated white carbon black are added and mixed at high speed for 30 seconds to obtain a mixture a.

[0044] S102: After the high-speed mixing is completed, environmentally friendly aromatic oil is added to the mixture a, and the speed is reduced to 45 rpm and the mixing is continued until the temperature is raised to 125° C. to obtain a mixture b.

[0045] S103: After the speed reduction and mixing are completed, long-chain alkoxy-modified mercaptosilane is added to the mixture b, and the speed is reduced to 40 rpm and the mixing is continued until the temperature is raised to 135° C. to obtain a mixture c.

[0046] S104: Add zinc oxide to the mixture c, reduce the speed to 35 rpm and continue mixing until the temperature reaches 145°C, and the mixing is completed. After the mixing is completed, the rubber is discharged and enters the lower internal mixer.

[0047] S105: The lower internal mixer is mixed at a constant temperature of 140° C. for 2 minutes, and then discharged into an automatic open mixer, and mixed for 3.5 minutes, and then cooled to obtain a masterbatch.

[0048] S106: the masterbatch which has been stored for 8 hours is mixed with N-cyclohexyl-2-benzothiazolesulfenamide and sulfur for 2.5 minutes and then discharged into an automatic mixing mill. After further mixing for 2 minutes, the masterbatch is cooled to obtain a final rubber mix.

[0049] S107: The final rubber mixture that has been stored for 8 hours is fed into a three-compound extruder and extruded into a tread according to a standard size to obtain a green tire tread.

[0050] Example 2 An embodiment of the present application provides a rubber composition, which includes 20kg of natural rubber, 80kg of non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber, 10kg of carbon black, 60kg of precipitated silica, 6kg of long-chain alkoxy-modified mercaptosilane, 3kg of silica dispersant, 8kg of modified dicyclopentadiene resin, 1kg of microcrystalline wax, 3kg of zinc oxide, 3kg of stearic acid, 5kg of environmentally friendly aromatic oil, 2kg of N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine, 1kg of N-cyclohexyl-2-benzothiazolesulfonamide and 2.5kg of sulfur.

[0051] The embodiment of the present application also uses the above-mentioned rubber composition to prepare a green tire tread, and the preparation method of the tread is the same as that of Example 1.

[0052] Example 3 An embodiment of the present application provides a rubber composition, which includes 30kg of natural rubber, 70kg of non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber, 0kg of carbon black, 70kg of precipitated silica, 5.5kg of long-chain alkoxy-modified mercaptosilane, 2.8kg of silica dispersant, 6kg of modified dicyclopentadiene resin, 2kg of microcrystalline wax, 2.3kg of zinc oxide, 2.5kg of stearic acid, 8kg of environmentally friendly aromatic oil, 3kg of N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine, 2kg of N-cyclohexyl-2-benzothiazolesulfonamide and 2kg of sulfur.

[0053] The embodiment of the present application also uses the above-mentioned rubber composition to prepare a green tire tread, and the preparation method of the tread is the same as that of Example 1.

[0054] Example 4 An embodiment of the present application provides a rubber composition, which includes 28kg of natural rubber, 72kg of non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber, 6kg of carbon black, 66kg of precipitated silica, 5.4kg of long-chain alkoxy-modified mercaptosilane, 2.7kg of silica dispersant, 7kg of modified dicyclopentadiene resin, 1.6kg of microcrystalline wax, 2.5kg of zinc oxide, 2.6kg of stearic acid, 8kg of environmentally friendly aromatic oil, 2.1kg of N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine, 1.4kg of N-cyclohexyl-2-benzothiazolesulfonamide and 2.1kg of sulfur.

[0055] The embodiment of the present application also uses the above-mentioned rubber composition to prepare a green tire tread, and the preparation method of the tread is the same as that of Example 1.

[0056] The present application example conducted a comparative test to compare the effects of different addition amounts of long-chain alkoxy-modified mercaptosilane on tire tread performance. The addition amount of each test group is shown in Table 1.

[0057] Table 1: Addition amount of test groups 1-3 The compositions of test groups 1-3 were tested for processing performance, static mechanical properties, DMA dynamic performance temperature test and finished tire indoor performance test. The specific test process and results are as follows: 1. Processing performance The compositions of test groups 1-3 were prepared into tread rubbers, and the tread rubbers of test groups 1-3 were tested for Mooney viscosity, Mooney scorch and vulcanization characteristic curves, respectively, and the results shown in Table 2 were obtained. The test process of Mooney viscosity and Mooney scorch was carried out in accordance with ASTM D1646-2007, the test temperature of Mooney viscosity was 100°C, preheating for 1 minute, and testing for 4 minutes; the test temperature of Mooney scorch was 130°C. The test process of vulcanization characteristic curve was carried out in accordance with the national standard GB / T16584-96, the test temperature was 150°C, and the test time was 60 minutes.

[0058] Table 2: Processing performance test results As shown in Table 2, the Mooney viscosity of Test 1 using ordinary silane SI69 is lower, the Mooney scorch time is longer, and the processing safety performance is good; while the Mooney viscosity of Tests 2 and 3 using long-chain alkoxy-modified mercaptosilane is improved, the vulcanization speed becomes faster, and the process performance of the test scheme is not much different from the normal scheme, which meets the expected design goals and meets the production process performance requirements.

[0059] 2. Static mechanical properties The compositions of test groups 1 to 3 were prepared into tread rubbers, and the tensile properties were tested using an Instron tensile testing machine (INSTRON3365, Instron Corporation, USA). The test process was carried out in accordance with national standards such as GB / T 528-2009, GB / T 529-2009, and GB / T 531-2009. The test results are shown in Table 3. Among them, the tensile rate was 500 mm / min, the test temperature was 23±2°C, and the sample size was strictly prepared and tested according to national standard type 1.

[0060] Table 3: Tensile properties test results As shown in Table 3, the MA300 / MA100 values ​​of Test 2 and Test 3 using long-chain alkoxy-modified mercaptosilane are significantly improved, which indicates that the interaction between fillers such as white carbon black and rubber is more solid. The compression heat generation and rebound performance of the tread rubber of Test 2 and Test 3 are also significantly better than those of the tread rubber of Test 1, which indicates that the dynamic performance of the rubber is better, the internal energy loss is less during deformation, and the rolling resistance performance is better. Other mechanical properties are also slightly improved.

[0061] 3. DMA dynamic performance temperature test The compositions of test groups 1-3 were prepared into tread rubber, and the vulcanized rubber was subjected to temperature scanning in the tensile mode using a DMA+1000 dynamic mechanical analyzer from Metravib, France. The scanning results are shown in Table 4. Figure 1-3Test conditions: temperature range is -30℃~70℃, temperature rise is 2℃ / min, frequency is 10Hz, static strain is 7%, and dynamic strain is 0.25%.

[0062] Table 4: DMA data analysis It can be seen from Table 4 that the Tanδ (@60℃) characterizing the rolling resistance and the Tanδ (@0℃) characterizing the wet performance in Test 2 and Test 3 using long-chain alkoxy-modified mercaptosilane are greatly improved, and the dynamic properties of the vulcanized rubber are significantly improved, which is consistent with the data change trend in Table 3.

[0063] 4. Indoor performance test of finished tires The compositions of test groups 1-3 were prepared into tread rubber, and then prepared into 225 / 45ZR18 UHP 95W tires according to normal molding and vulcanization procedures. The high speed, durability, puncture strength, rolling resistance coefficient, wet grip index and other performance tests were performed on each finished tire, and the results are shown in Table 5.

[0064] Table 5: Performance test data of finished tires As can be seen from Table 5, the rolling resistance and wet performance of the finished tires of Test 1 both reach the EU label B level, and the rolling resistance and wet performance of the finished tires of Tests 2 and 3 using long-chain alkoxy-modified mercaptosilane can be improved by one level, reaching the EU label A level.

[0065] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rubber composition, characterized in that: The invention comprises diene rubber, carbon black, precipitated silica, long-chain alkoxy-modified mercaptosilane, silica dispersant, modified dicyclopentadiene resin, microcrystalline wax, zinc oxide, stearic acid and environmentally friendly aromatic oil, wherein the diene rubber comprises natural rubber and non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber, and the long-chain alkoxy-modified mercaptosilane is prepared by modifying the long chain of mercaptosilane with alkoxy groups.

2. The rubber composition according to claim 1, characterized in that The composition comprises, by weight, 100 parts of diene rubber, 0-10 parts of carbon black, 60-70 parts of precipitated silica, 5-6 parts of long-chain alkoxy-modified mercaptosilane, 2-3 parts of silica dispersant, 5-8 parts of modified dicyclopentadiene resin, 1-2 parts of microcrystalline wax, 2-3 parts of zinc oxide, 2-3 parts of stearic acid, and 5-10 parts of environmentally friendly aromatic oil, wherein the diene rubber comprises 20-30 parts of natural rubber and 70-80 parts of non-oil-extended double-end modified solution-polymerized styrene-butadiene rubber.

3. The rubber composition according to claim 1, characterized in that The non-oil-filled dual-end modified solution-polymerized styrene-butadiene rubber has a styrene content of 21 wt %, a vinyl content of 55 wt %, a glass transition temperature of -36°C, and a typical Mooney viscosity ML (1+4) of 70-80 at 100°C.

4. The rubber composition according to claim 1, characterized in that The long-chain alkoxy-modified mercaptosilane has a heating loss of ≤3.5% at 100° C.*2h, and a refractive index of 1.4500-1.4800.

5. The rubber composition according to claim 1, characterized in that The specific surface area of ​​the precipitated silica is 165 m 2 / g, heating loss at 105℃ is 4%-8%, burning loss at 1000℃*2h is <7%, and water-soluble matter is <2%.

6. The rubber composition according to claim 1, characterized in that The modified dicyclopentadiene resin has a softening point of 95-105°C, an acidity calculated in terms of KOH of ≤0.5mg, an ash content of ≤0.1% at 550°C, a heating loss of ≤0.1% at 105°C*2h, and a flash point of >200°C.

7. The rubber composition according to any one of claims 1 to 6, characterized in that It also includes 2-3 parts of N(1,3-dimethylbutyl)-N / -phenyl-p-phenylenediamine, 1-2 parts of N-cyclohexyl-2-benzothiazole sulfenamide and 2-2.5 parts of sulfur.

8. A green tire tread, characterized in that: The rubber composition is prepared by using the rubber composition described in any one of claims 1 to 7.

9. A tire, characterized in that: Comprising the green tire tread as described in claim 8.

10. A method for preparing a green tire tread, characterized in that: include: Add diene rubber, white carbon black dispersant, modified dicyclopentadiene resin, microcrystalline wax, zinc oxide and stearic acid into the upper internal mixer of the series internal mixer, mix at a high speed of 60 rpm, add carbon black and precipitated white carbon black and mix at a high speed to obtain a mixture a; wherein the diene rubber includes natural rubber and non-oil-extended double-end modified solution polymerized styrene-butadiene rubber; Adding environmentally friendly aromatic oil to the mixture a, reducing the speed to 45 rpm and continuing to mix until the temperature reaches 125° C., to obtain a mixture b; Adding long-chain alkoxy-modified mercaptosilane to the mixture b, reducing the speed to 40 rpm and continuing to mix until the temperature reaches 135° C., to obtain a mixture c; Add zinc oxide to the mixture c, reduce the speed to 35 rpm and continue mixing until the temperature reaches 145° C., and then discharge into the lower internal mixer; The lower internal mixer is mixed at a constant temperature of 140° C. for 2 minutes, and then discharged into an automatic open mixer, and mixed for 3.5 minutes, and then the lower sheet is cooled to obtain a masterbatch; The masterbatch which has been stored for 8 hours is mixed with N-cyclohexyl-2-benzothiazolesulfenamide and sulfur for 2.5 minutes and then discharged into an automatic mixing mill, and the mixing is continued for 2 minutes and then the sheet is cooled to obtain a final rubber mix; The final rubber compound which has been stored for 8 hours is extruded into a tread to obtain a green tire tread.

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